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VBUSVALID and VDD5V Brownout configuration (IMX28)

Question asked by Damien Gotfroi on Aug 12, 2014
Latest reply on Aug 12, 2014 by igorpadykov



Can you please tell me, how and where can I configure VBUSVALID voltage and VDD5V Brownout voltage ?


I read the AP AN4199 "Using the i.MX28 Power Management Unit and Battery Charger", and it said :



The threshold value for a valid 5-V status is configured in the software, and the default value is 4.4 V on the Linux BSP. "




"VDD5V Brownout

The VDD5V-source

brownout level is a voltage threshold and is an absolute voltage value as in the case of a battery brownout.

There are four available settings for VBUS droop brownout:

• 4.3 V

• 4.4 V

• 4.5 V

• 4.7 V

Each setting has a 50-mV hysteresis to prevent chattering. It is set to 4.5 V in the Linux BSP "


But I would like to know in which file do i need to make the modifications ?


Many thanks in advance.